EMISSION_SHAPE_POINT = 0 — All particles will be emitted from a single point.

EMISSION_SHAPE_SPHERE = 1 — Particles will be emitted in the volume of a sphere.

EMISSION_SHAPE_BOX = 2 — Particles will be emitted in the volume of a box.

EMISSION_SHAPE_POINTS = 3 — Particles will be emitted at a position chosen randomly among emission_points. Particle color will be modulated by emission_colors.

EMISSION_SHAPE_DIRECTED_POINTS = 4 — Particles will be emitted at a position chosen randomly among emission_points. Particle velocity and rotation will be set based on emission_normals. Particle color will be modulated by emission_colors.

The particle system’s frame rate is fixed to a value. For instance, changing the value to 2 will make the particles render at 2 frames per second. Note this does not slow down the particle system itself.